Class RootSelector
- java.lang.Object
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- ej.mwt.stylesheet.selector.RootSelector
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- All Implemented Interfaces:
Selector
public class RootSelector extends java.lang.Object implements Selector
A root selector selects by checking if a widget is the root widget of its hierarchy (i.e. if it has no parent).Equivalent to
:root
selector in CSS. Its specificity is (0,0,1,0).- See Also:
SelectorHelper
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Field Summary
Fields Modifier and Type Field Description static RootSelector
ROOT_SELECTOR
Root selector singleton to avoid creating several ones.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
appliesToWidget(Widget widget)
Checks whether or not this selector applies to the given widget.boolean
equals(java.lang.Object obj)
Indicates whether some other object is "equal to" this one.int
getSpecificity()
Returns the specificity of this selector.int
hashCode()
Returns a hash code value for the object.
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Field Detail
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ROOT_SELECTOR
public static final RootSelector ROOT_SELECTOR
Root selector singleton to avoid creating several ones.
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Method Detail
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appliesToWidget
public boolean appliesToWidget(Widget widget)
Description copied from interface:Selector
Checks whether or not this selector applies to the given widget.- Specified by:
appliesToWidget
in interfaceSelector
- Parameters:
widget
- the widget to test.- Returns:
true
if this selectors applies to the given widget,false
otherwise.
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getSpecificity
public int getSpecificity()
Description copied from interface:Selector
Returns the specificity of this selector.The specificity allows to determine in which order the rules of a stylesheet should be applied.
A specificity is composed of four numbers (defined by CSS2 specification):
- count 1 if the declaration is from is a 'style' attribute rather than a rule with a selector, 0 otherwise (= a)
- count the number of ID attributes in the selector (= b)
- count the number of other attributes and pseudo-classes in the selector (= c)
- count the number of widget names and pseudo-widgets in the selector (= d)
SelectorHelper
provides a method to compute the specificity of a selector.- Specified by:
getSpecificity
in interfaceSelector
- Returns:
- the specificity of this selector.
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equals
public boolean equals(@Nullable java.lang.Object obj)
Description copied from class:java.lang.Object
Indicates whether some other object is "equal to" this one.The
equals
method implements an equivalence relation on non-null object references:- It is reflexive: for any non-null reference value
x
,x.equals(x)
should returntrue
. - It is symmetric: for any non-null reference values
x
andy
,x.equals(y)
should returntrue
if and only ify.equals(x)
returnstrue
. - It is transitive: for any non-null reference values
x
,y
, andz
, ifx.equals(y)
returnstrue
andy.equals(z)
returnstrue
, thenx.equals(z)
should returntrue
. - It is consistent: for any non-null reference values
x
andy
, multiple invocations ofx.equals(y)
consistently returntrue
or consistently returnfalse
, provided no information used inequals
comparisons on the objects is modified. - For any non-null reference value
x
,x.equals(null)
should returnfalse
.
The
equals
method for classObject
implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference valuesx
andy
, this method returnstrue
if and only ifx
andy
refer to the same object (x == y
has the valuetrue
).Note that it is generally necessary to override the
hashCode
method whenever this method is overridden, so as to maintain the general contract for thehashCode
method, which states that equal objects must have equal hash codes. - It is reflexive: for any non-null reference value
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hashCode
public int hashCode()
Description copied from class:java.lang.Object
Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided byHashMap
.The general contract of
hashCode
is:- Whenever it is invoked on the same object more than once during an execution of a Java
application, the
hashCode
method must consistently return the same integer, provided no information used inequals
comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application. - If two objects are equal according to the
equals(Object)
method, then calling thehashCode
method on each of the two objects must produce the same integer result. - It is not required that if two objects are unequal according to the
Object.equals(java.lang.Object)
method, then calling thehashCode
method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.
As much as is reasonably practical, the hashCode method defined by class
Object
does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the JavaTM programming language.)- Overrides:
hashCode
in classjava.lang.Object
- Returns:
- a hash code value for this object.
- See Also:
Object.equals(java.lang.Object)
,System.identityHashCode(java.lang.Object)
- Whenever it is invoked on the same object more than once during an execution of a Java
application, the
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